Philips HU 4803/01 Effective area: 25 m2 Capacity water container: 2 l Operating time: 8 h Noise level (dB): 26 Moistening rate: 220 ml/h Safe and clean NanoCloud technology Three-step, advanced evaporation system with NanoCloud technology Even distribution of moistened air in the whole room Selection of 40, 50, and 60 percent air humidity The digital sensor continuously monitors air humidity for a constant air humidity level Sleep mode